Rev B MacBook RAM upgrade to 2.5 GB?

Hi everyone, I have a MacBook from the summer 2007 upgrade cycle. I've read in the manual that this laptop takes up to 2 GB of RAM, with a 1 GB stick in each slot. I just ordered a 2 GB stick, thinking I'd pull out one of the 512 MB sticks and add in the 2 GB, making it 2.5 GB. I read on Canadaram.com that you can put in two 2 GB sticks of RAM, but the computer will only recognize 3 GB.

My question is, which way is it? Will the the 2 GB work with my 512 MB, giving me 2.5 GB? Or should I cancel my order and order two 1 GB sticks bringing it to 2 GB total?

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